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DSA Pythonprogramming~10 mins

Delete Node at Beginning in DSA Python - Interactive Practice

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Practice - 5 Tasks
Answer the questions below
1fill in blank
easy

Complete the code to delete the first node in a singly linked list.

DSA Python
def delete_at_beginning(head):
    if head is None:
        return None
    head = [1]
    return head
Drag options to blanks, or click blank then click option'
Ahead.prev
Bhead.next
Chead
DNone
Attempts:
3 left
💡 Hint
Common Mistakes
Assigning head to None removes the entire list.
Using head.prev instead of head.next causes errors.
2fill in blank
medium

Complete the code to update the head after deleting the first node in a linked list.

DSA Python
def delete_first_node(head):
    if head is None:
        return None
    temp = head
    head = [1]
    temp.next = None
    return head
Drag options to blanks, or click blank then click option'
Ahead.prev
Btemp.next
Chead.next
Dtemp.prev
Attempts:
3 left
💡 Hint
Common Mistakes
Using head.prev which is not valid in singly linked list.
Not updating head causes the list to remain unchanged.
3fill in blank
hard

Fix the error in the code to properly delete the first node of a singly linked list.

DSA Python
def delete_head_node(head):
    if head is None:
        return None
    head = [1]
    return head
Drag options to blanks, or click blank then click option'
Ahead
Bhead.prev
CNone
Dhead.next
Attempts:
3 left
💡 Hint
Common Mistakes
Using 'prev' attribute which does not exist in singly linked lists.
Not checking if head is None before deletion.
4fill in blank
hard

Fill both blanks to delete the first node and return the updated head.

DSA Python
def remove_first(head):
    if head is None:
        return None
    temp = head
    head = [1]
    temp.[2] = None
    return head
Drag options to blanks, or click blank then click option'
Ahead.next
Bhead.prev
Cnext
Dprev
Attempts:
3 left
💡 Hint
Common Mistakes
Using 'prev' instead of 'next' in singly linked list.
Not disconnecting the old head's next pointer.
5fill in blank
hard

Fill all three blanks to delete the first node and return the updated head safely.

DSA Python
def delete_first(head):
    if head is None:
        return None
    temp = head
    head = [1]
    temp.[2] = None
    temp = None
    return [3]
Drag options to blanks, or click blank then click option'
Ahead.next
Bnext
Chead
Dprev
Attempts:
3 left
💡 Hint
Common Mistakes
Returning old head instead of new head.
Using 'prev' which is invalid in singly linked list.